Utility Tools
Privacy-first, in-browser tools built across the OCXLY ecosystem — for AI, wellness, development, and creative work.
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Intelligence Utilities
Tools for language models, prompt engineering, and API cost analysis.
osoftly.com ↗LLM Cost Calculator
Compare API costs across GPT, Claude, Gemini, and other model price tiers. Enter token counts and see totals instantly — every price is editable.
Open Tool →Prompt Builder
Scaffold structured LLM prompts — role, task, context, examples, format, constraints — and export in plain, Markdown, or XML style.
Open Tool →Token Counter
Estimate LLM token usage for GPT and other models with a BPE-aware approximation — real pre-tokenisation plus byte-calibrated subword counting.
Open Tool →Base64 Encoder / Decoder
Encode plain text or files to Base64 and decode Base64 strings back — URL-safe mode and live conversion, all in-browser.
Open Tool →Wellness & Accessibility
Cognitive wellness, sleep, focus, and accessibility tools grounded in neuroscience.
cxneuro.com ↗Sleep Calculator
Calculate optimal wake times or bedtimes to align with your natural 90-minute sleep cycles and wake feeling rested.
Open Tool →BMI Calculator
Calculate your Body Mass Index in metric or imperial units and see WHO category breakpoints with healthy-weight ranges for your height.
Open Tool →Calorie & TDEE Calculator
Estimate daily calorie burn (BMR and TDEE) with the Mifflin-St Jeor equation, and see targets for losing, maintaining or gaining. In your browser.
Open Tool →Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy circumference method — just a tape measure. Nothing is uploaded.
Open Tool →Ideal Weight Calculator
See estimated ideal body weight from four classic formulas — Devine, Robinson, Miller and Hamwi — based on height and sex.
Open Tool →One-Rep Max Calculator
Estimate your one-rep max from a weight and reps (Epley & Brzycki), with a full training percentage table. Runs in your browser.
Open Tool →Countdown Timer & Stopwatch
A precise, drift-corrected countdown timer and stopwatch with laps, presets, and a gentle chime when time's up. No sign-in, no tracking.
Open Tool →Developer Essentials
Precision tools for developers — formatting, regex, and text transforms.
ocxlydev.site ↗JSON Formatter
Format, validate, and beautify JSON with syntax highlighting and error detection — paste raw JSON and get it clean instantly.
Open Tool →XML Formatter
Pretty-print, indent and validate XML — or minify it — entirely in your browser. Your data is never uploaded.
Open Tool →CSV ↔ JSON
Convert CSV to JSON and back, with configurable delimiter and header row and full RFC 4180 quoted-field support. Nothing is uploaded.
Open Tool →YAML ↔ JSON
Convert YAML to JSON and back using a self-contained in-browser parser (js-yaml). Nothing is uploaded.
Open Tool →Cron Expression Builder
Write or paste a cron expression and instantly see it in plain English, plus the next run times, with handy presets. Runs in your browser.
Open Tool →Network Information Viewer
See your connection type, estimated speed, latency and data-saver status — and whether you're online — updating live. Read locally in your browser.
Open Tool →Vibration Tester
Test your device's vibration motor with preset buzzes and your own custom patterns, using the Web Vibration API. Works on supporting phones.
Open Tool →Clipboard Inspector
Read what's on your clipboard and see which data types it holds, or write test text — using the async Clipboard API. Nothing is stored or uploaded.
Open Tool →Geolocation Viewer
See your device's location — latitude, longitude, accuracy and more — with your permission, using the Geolocation API. Your coordinates never leave your browser.
Open Tool →Camera Tester
Check that your webcam works — see a live preview, switch between cameras and read the actual resolution and frame rate. Nothing is recorded or uploaded.
Open Tool →Microphone Tester
Check that your mic works — a live input-level meter and waveform react to your voice, with a device picker. Nothing is recorded or uploaded.
Open Tool →Speaker Tester
Check your left and right speakers or headphones with a clean test tone — one channel at a time or both. Tones are generated live, no audio files.
Open Tool →CSS Gradient Generator
Design linear, radial and conic gradients with live preview, add as many colour stops as you like, and copy the CSS. Runs in your browser.
Open Tool →Glassmorphism Generator
Design frosted-glass UI cards with live preview — tune blur, transparency, saturation and border — and copy the CSS (with -webkit- prefix).
Open Tool →Neumorphism Generator
Design soft-UI (neumorphic) elements with live preview — pick the surface colour, size and depth, choose flat/concave/convex/pressed, and copy the CSS.
Open Tool →MIME Type Finder
Look up the MIME (media) type for any file extension or find extensions for a MIME type, and drop a file to see the type your browser reports.
Open Tool →Text Diff Checker
Compare two texts or documents line by line with word-level change highlighting, powered by the same Myers algorithm as Git. 100% browser-based, no uploads.
Open Tool →Password Generator
Strong random passwords or memorable EFF-wordlist passphrases, built from your browser's cryptographic randomness (Web Crypto) with a real bits-of-entropy meter. Never sent or stored.
Open Tool →Regex Tester
Live regex matching with real-time highlighting, capture groups, replace preview, flag toggles, and a JavaScript regex cheatsheet.
Open Tool →JSON Diff
Compare two JSON documents structurally and see every added, removed or changed key by path — ignoring key order and whitespace. All in your browser.
Open Tool →JSON to TypeScript
Paste JSON and generate typed TypeScript interfaces — nested objects become their own interfaces and arrays unify to T[]. Entirely in your browser.
Open Tool →CSS Unit Converter
Convert a value between px, rem, em, pt, pc, in, cm and mm at once, with configurable root and parent font sizes. Computed live in your browser.
Open Tool →Image Colour Picker
Upload an image and click to lift any pixel's exact colour as HEX, RGB and HSL, with a swatch history. The image stays in your browser — nothing is uploaded.
Open Tool →Meta Tag Generator
Build SEO, Open Graph and Twitter Card meta tags from a simple form — HTML-escaped and ready to paste into your <head>. Generated in your browser.
Open Tool →Box Shadow Generator
Dial in offset, blur, spread, colour and opacity with a live preview and copy the exact CSS box-shadow — inset supported. All in your browser.
Open Tool →Markdown TOC Generator
Turn your Markdown headings into a nested, linked table of contents with GitHub-style anchor slugs. Code blocks ignored, runs locally.
Open Tool →CSS Specificity Calculator
Enter a CSS selector and see its (A, B, C) specificity broken down by IDs, classes and elements — so you know which rule wins. Computed live in your browser.
Open Tool →Morse Code Translator
Convert text to International Morse code and back, with adjustable-speed audio playback of the dots and dashes. Everything runs in your browser.
Open Tool →UUID Generator
Generate cryptographically-random version-4 UUIDs one at a time or in bulk, with uppercase, no-dashes, braces and quoted-list formatting.
Open Tool →NanoID Generator
Generate compact, URL-safe NanoIDs with a custom size and alphabet — an unbiased, secure alternative to UUIDs, with live entropy. Runs locally.
Open Tool →Case Converter
Convert text between 16 cases instantly — UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, slug, and more.
Open Tool →Unix Timestamp Converter
Convert epoch timestamps to human dates and back — seconds and milliseconds, local time and UTC, with a live clock and ISO 8601 output. 100% in your browser.
Open Tool →URL Encoder / Decoder
Percent-encode text for URLs or decode it back, in real time — with component (encodeURIComponent) and full-URI modes. Nothing is uploaded.
Open Tool →Hash Generator
Compute MD5, SHA-1, SHA-256 and SHA-512 checksums from text or a file, instantly. Verify downloads and de-duplicate — nothing is uploaded.
Open Tool →HMAC Generator
Compute an HMAC signature from a message and secret key with Web Crypto — SHA-256/384/512/1, in hex or Base64. The key never leaves your device.
Open Tool →AES Encryption
Encrypt or decrypt text with a password using AES-256-GCM and PBKDF2 key-stretching, via Web Crypto. Nothing is uploaded; the password is never stored.
Open Tool →HTML Preview
Type or paste HTML and see it render live in a safe, sandboxed frame — a quick scratchpad for snippets and layout tests. Everything stays in your browser.
Open Tool →Word Frequency Analyzer
Count how often each word appears in your text — ranked with percentages, with case-folding and common-word filtering. Runs entirely in your browser.
Open Tool →CSS Minifier
Shrink CSS by stripping comments and needless whitespace — safely preserving strings, calc() spacing and combinators. See how many bytes you save.
Open Tool →PWA Manifest Generator
Fill in your app details and get a valid manifest.json plus the link tag to make any site installable as a progressive web app. Generated in your browser.
Open Tool →SVG Optimizer
Strip editor metadata, comments and namespaces and round coordinates to shrink SVG files — the drawing stays identical. All in your browser, nothing uploaded.
Open Tool →Wheel of Names
Enter names and spin to draw a fair random winner using secure randomness, with optional remove-winner. Perfect for giveaways, chores and standup order.
Open Tool →Avatar Generator
Turn any name, email or username into a unique, deterministic identicon — the same seed always makes the same avatar. Export as PNG, entirely in your browser.
Open Tool →Pixel Art Editor
Draw pixel art on an 8–32px grid with a colour picker and eraser, then export a crisp PNG. Sprites, icons and avatars — all in your browser, nothing uploaded.
Open Tool →ASCII Art Generator
Turn any image into text art with adjustable width, character ramps and invert. Processed entirely in your browser — the image is never uploaded.
Open Tool →Random Quote Generator
Draw an inspiring quote on creativity, focus, resilience or technology — every quote ships with the page, so it works fully offline with no tracking.
Open Tool →Browser Fingerprint
See the signals a website can read from your browser with no permission — screen, time zone, canvas, WebGL — combined into a semi-unique hash. A privacy demo, all local.
Open Tool →URL Parser
Break any URL into its parts — protocol, host, port, path, query and fragment — and see every query parameter decoded. Runs in your browser.
Open Tool →User-Agent Parser
Decode a User-Agent string into browser, rendering engine, operating system and device type — or analyse your own. All in your browser.
Open Tool →JWT Decoder
Decode a JSON Web Token to inspect its header and payload, with timestamps made human-readable. Your token is never uploaded (signature not verified).
Open Tool →Screen Resolution Checker
Instantly see your screen resolution, physical pixels, device pixel ratio, colour depth and aspect ratio — updating live as you move between displays.
Open Tool →Viewport Tester
Watch your browser viewport size live as you resize the window, and see which responsive breakpoint is active. Perfect for testing responsive layouts.
Open Tool →Browser Feature Detector
Check which modern web APIs and CSS features your browser supports — from WebGPU and Service Workers to :has() and container queries. Searchable list.
Open Tool →ROT13 Encoder
Rotate text by 13 places — the classic reversible cipher — plus ROT5 for digits and ROT47 for all printable ASCII. Nothing is uploaded.
Open Tool →Caesar Cipher
Encode or decode a Caesar cipher at any shift, with a one-click brute-force view of all 26 shifts to crack an unknown message. 100% in-browser.
Open Tool →HTML Entity Encoder / Decoder
Escape &, <, > and quotes for safe markup, or decode entities back to text — with an option to encode every non-ASCII character. Runs locally.
Open Tool →Writing & Productivity
Tools for time, focus, and everyday productivity.
Pomodoro Timer
Boost productivity with the Pomodoro technique — focused work intervals, strategic breaks, and session progress tracking.
Open Tool →Fancy Text Generator
Turn plain text into bold, italic, script, monospace, circled and small-caps Unicode styles you can copy-paste into bios, chats and social media.
Open Tool →Date & Age Finder
Calculate days between two dates, ISO week numbers, and exact age in years, months, and days — with flexible date format options.
Open Tool →Online Notepad
A distraction-free notepad that autosaves in your browser and works offline — live word count and download as .txt, Markdown, Word (.docx), RTF or HTML. Nothing is ever uploaded.
Open Tool →To-Do List
A simple, private to-do list that saves itself in your browser — add, check off, drag to reorder, filter, and export as .txt, Markdown, CSV, JSON or Word. No account, no server.
Open Tool →Duplicate Line Remover
Paste a list and strip repeated lines in one click — ignore case and whitespace, drop blanks, sort, and keep the first or last occurrence. Nothing leaves your browser.
Open Tool →Writing & Publishing
Editorial tools for writers, editors, and publishers — drafts, documents, and typography.
bookstair.com ↗Markdown Editor
A distraction-free, live-preview Markdown editor with a syntax toolbar, export to HTML and .md, and auto-save.
Open Tool →Word Counter
Instantly count words, characters, sentences, and paragraphs. Perfect for writers, developers, and content creators with targets.
Open Tool →Readability Analyser
Score your text with Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI, plus a sentence-by-sentence difficulty map.
Open Tool →Lorem Ipsum Generator
Generate placeholder text in 5 flavours — Classic Latin, Tech, Space, Nature, Neuro — by paragraphs, sentences, words, or bytes. Export as text, HTML, or Markdown.
Open Tool →Slug Generator
Turn titles into clean, URL-safe slugs — one per line, with your choice of separator, accent stripping and lowercasing. Nothing is uploaded.
Open Tool →Find & Replace
Find and replace text with optional regular expressions, case-insensitive matching and whole-word mode, plus a live match count. Entirely in your browser.
Open Tool →Whitespace Remover
Clean up messy text — trim lines, collapse repeated spaces, drop blank lines and convert tabs — instantly, all in your browser.
Open Tool →Line Sorter
Sort, reverse, shuffle and de-duplicate lines — alphabetically, numerically or by length — instantly and entirely in your browser.
Open Tool →Random Number Generator
Generate cryptographically strong random numbers — set any range, quantity, decimals, uniqueness and sorting. Unbiased and entirely in your browser.
Open Tool →Random Picker
Draw fair winners from a list — pick one or many, with optional remove-as-you-go for raffles and giveaways. Uses secure randomness, no uploads.
Open Tool →Password Strength Checker
Measure password entropy in bits, estimate crack time and see actionable checks — length, character variety and common patterns. Nothing leaves your device.
Open Tool →PDF to Word Converter
Convert PDF files to editable Word (.docx) documents entirely in your browser — no uploads, no server, full privacy. Preserves text and headings.
Open Tool →PDF Splitter
Split PDFs by page ranges or extract individual pages — 100% browser-based with no uploads, keeping your documents private.
Open Tool →PDF Merger
Combine multiple PDFs into a single document — reorder pages, drag-and-drop files, 100% browser-based with no uploads.
Open Tool →Image to PDF
Combine JPG, PNG or WebP images into a single PDF — reorder pages, pick page size and margins, then download. 100% browser-based, no uploads.
Open Tool →PDF to Image
Convert PDF pages to PNG or JPG images — choose resolution and page ranges, render in-browser with no uploads.
Open Tool →To Markdown Converter
Convert HTML, rich text, and documents to clean Markdown — preserves headings, lists, links, and code blocks. 100% in-browser.
Open Tool →Lesson Plan Generator
Generate structured lesson plans with objectives, materials, activities, and assessment — flexible templates for any subject or grade level.
Open Tool →Type Scale Generator
Generate harmonious typographic scales using musical ratios — preview heading and body sizes side by side and export CSS variables.
Open Tool →Math, Science & Calculators
Calculators and converters for science, mathematics, finance, and everyday measurement.
Scientific Calculator
Full scientific calculator with trigonometric, logarithmic, exponential, and power functions — degrees or radians, with calculation history.
Open Tool →Base Calculator
Convert numbers between Binary, Octal, Decimal, Hexadecimal, Base-32, Base-36, and any custom base 2–36 — with bit visualiser and reference table.
Open Tool →Roman Numeral Converter
Convert numbers to Roman numerals and back — with automatic direction detection and strict validation. Covers 1 to 3999, all in your browser.
Open Tool →Number to Words
Spell any number out in English — as a cardinal, an ordinal, or a US-dollar currency amount — handling decimals and negatives. Runs locally.
Open Tool →Prime Factorisation
Check whether a number is prime and break it into its prime factors, with divisor count and sum — big-integer precision, entirely in your browser.
Open Tool →GCD & LCM Calculator
Find the greatest common divisor and least common multiple of any list of whole numbers, with big-integer precision. Coprime numbers are flagged.
Open Tool →Discount Calculator
Work out the final price and how much you save after one or two stacked discounts, with quick presets. Runs entirely in your browser.
Open Tool →Margin & Markup Calculator
Turn cost and price into profit, margin and markup — or work backwards from a target margin or markup. All in your browser.
Open Tool →Salary Converter
Convert pay between hourly, daily, weekly, monthly and annual using your hours and days — every rate at once. Nothing is uploaded.
Open Tool →Aspect Ratio Calculator
Keep proportions when resizing — enter the original size and one new dimension to get the other, and see the simplified ratio.
Open Tool →Unit Converter
Comprehensive converter across 20+ categories — length, mass, temperature, area, volume, speed, data, pressure, energy, and more.
Open Tool →Loan Calculator
Calculate monthly payments, total interest, and full amortisation schedules for any loan — mortgages, auto, or personal — with adjustable term and rate.
Open Tool →Graph Calculator
Interactive graphing calculator — plot up to 8 functions simultaneously, pan and zoom, trace values, and export. Supports sin, cos, tan, log, sqrt, abs and all standard math.
Open Tool →Percentage Calculator
Five everyday percentage questions answered live — a share of a number, a ratio as a percent, percentage change, and increase or decrease. No formulas to remember.
Open Tool →Tip Calculator & Splitter
Work out the tip and split a bill between any number of people, with quick tip presets and optional rounding. Live totals, all in your browser.
Open Tool →GST / VAT Calculator
Add or remove GST, VAT or sales tax at any rate — see the net amount, the tax, and the gross total, with quick rate presets. Runs locally.
Open Tool →Compound Interest Calculator
See how savings or investments grow over time — with optional regular contributions and any compounding frequency. Live results, all in your browser.
Open Tool →Time Zone Converter
Convert a date and time from one time zone to another, with a live world clock for the same moment. Uses the browser time-zone database.
Open Tool →Working Days Calculator
Count the business days between two dates — excluding weekends and any holidays you list. Runs entirely in your browser.
Open Tool →ISO Week Number
Find the ISO-8601 week number for any date, plus the week's Monday-to-Sunday range and the day of the year. All in your browser.
Open Tool →Add or Subtract Days
Add or subtract years, months, weeks and days from a date, and see the resulting date and weekday. Runs entirely in your browser.
Open Tool →Images & Visual Media
Image, color, and visual-media tools for designers and content creators.
Image Compressor
Compress JPEG, PNG, and WebP images in your browser — adjust quality, resize, and convert formats with no uploads and full privacy.
Open Tool →EXIF & Metadata Remover
Strip GPS location, timestamps, and hidden EXIF/XMP metadata from JPEG, PNG, and WebP photos — losslessly, without re-compressing. Nothing leaves your device.
Open Tool →QR Code Generator
Turn any link, text, Wi-Fi login, or contact into a scannable QR code — custom colours, adjustable size, download as PNG or crisp SVG. Generated in your browser, never uploaded.
Open Tool →Watermark Generator
Add text or logo watermarks to your images — tile, diagonal, or single placement with adjustable opacity, size, and rotation. 100% browser-based, no uploads.
Open Tool →Colour Palette Generator
Generate palettes from any seed colour using 8 harmony rules — copy HEX/RGB/HSL and export as CSS variables, JSON, or SVG with 10-step shade scales.
Open Tool →Color Blind Test
A free 12-plate Ishihara-style screening for red–green color vision deficiency. Instant results, no signup, runs entirely in your browser.
Open Tool →Keyboard Navigation Tester
Paste HTML to find controls keyboard users can't reach — positive tabindex, links without href, click handlers on divs, and unlabelled buttons. Runs in your browser.
Open Tool →Focus Order Visualizer
See the exact order the Tab key follows through your page, and spot where a positive tabindex makes focus jump out of visual order. All local, no uploads.
Open Tool →Speech to Text
Dictate with your voice and get a live transcript you can copy, using your browser's built-in speech recognition. No signup, no app — works best in Chrome and Edge.
Open Tool →Contrast Grid
Paste a palette and score every text-on-background pair against WCAG AA/AAA at once — a full contrast matrix computed from relative luminance, in your browser.
Open Tool →Color Blindness Simulator
Simulate how designs appear to people with protanopia, deuteranopia, tritanopia, and other color vision deficiencies.
Open Tool →Contrast Checker
Check the contrast ratio between two colors against WCAG AA and AAA thresholds for accessible web and UI design.
Open Tool →Alt Text Checker
Paste HTML and audit every image for missing, empty or low-quality alt attributes against WCAG 1.1.1 — with fix hints, entirely in your browser.
Open Tool →Heading Structure Analyzer
See the h1–h6 outline a screen reader builds from your HTML, and catch a missing h1, duplicate h1s or skipped levels. Runs locally, no uploads.
Open Tool →Dyslexia-Friendly Text Formatter
Reformat any text for easier reading — adjustable letter/word spacing, line height, typeface and background tint, with a live preview. All in your browser.
Open Tool →Text-to-Speech Reader
Have any text read aloud using your browser's built-in voices, with adjustable speed and pitch. No API, no uploads — it runs on your device.
Open Tool →JPG to PNG Converter
Convert JPG images to PNG with transparent or solid backgrounds — batch convert in your browser with no uploads.
Open Tool →Video Joiner
Join multiple video clips into a single file — drag, reorder, and merge in-browser with no uploads and full privacy.
Open Tool →Image Resizer
Resize any image to exact pixels or a percentage, lock the aspect ratio, and export as JPEG, PNG, or WebP — entirely in your browser. Your photo is never uploaded.
Open Tool →Image Cropper
Crop any image to a custom region or fixed aspect ratio and download it at full resolution — drag to move, pull the handles to resize. Nothing is uploaded.
Open Tool →Favicon Generator
Turn any image into a full favicon set — PNGs at every size, a multi-resolution .ico, and the ready-to-paste HTML. Generated entirely in your browser.
Open Tool →Dominant Colour Finder
Find the single most dominant colour of any image, with HEX, RGB and HSL ready to copy. The analysis runs on-device — your image never leaves your browser.
Open Tool →Colour Palette From Image
Extract a harmonious colour palette from any photo with median-cut quantisation. Click a swatch to copy its HEX, or grab the whole set as CSS variables. No uploads.
Open Tool →Colour Converter
Convert any CSS colour between HEX, RGB, HSL, HSV and CMYK, with a live swatch and picker. Click any value to copy. Runs entirely in your browser.
Open Tool →Colour Mixer
Blend two colours at any ratio and read off the HEX/RGB/HSL result, with a live gradient of the steps between them. Nothing is uploaded.
Open Tool →Tints & Shades
Generate a full ramp of tints, shades and tones from any base colour — click any swatch to copy its HEX. All in your browser.
Open Tool →Colour Harmony Generator
Build complementary, analogous, triadic, split-complementary, tetradic and monochromatic schemes from one base colour. Copy any swatch.
Open Tool →Webcam Filters
Apply live filters to your webcam — grayscale, sepia, blur, hue-shift and more — and snap a photo to download. Everything is processed on-device, nothing uploaded.
Open Tool →SVG Blob Generator
Generate smooth, organic blob shapes as SVG — tune the number of points and edge randomness, recolour, and download or copy the SVG.
Open Tool →Sound & Breath
Audio and breathing tools to ride the wave — focus, calm, and reset.
Focus Soundscape
Ambient soundscapes and binaural beats to enhance focus, meditation, and productivity — crafted for neurodivergent and deep-work sessions.
Open Tool →Breathing Timer
Animated breathing guide for box breathing, 4-7-8, the physiological sigh, coherent breathing, and extended exhale — with science-backed notes.
Open Tool →Metronome
Accurate online metronome with tap tempo, accent beats, and three click sounds — sample-accurate Web Audio timing, 30–240 BPM, right in your browser.
Open Tool →Tone & Frequency Generator
Generate pure tones from 20 Hz to 20 kHz — tune to A440, test left/right speakers, and explore waveforms. Runs entirely in your browser, nothing uploaded.
Open Tool →Play & Cognition
Interactive games and reaction challenges that test focus, speed, and strategy.
Galaxy Chess
Two-player live chess over a shared 5-digit key — create a game, share the code with your opponent, and play in real time.
Open Tool →Dice & Coin Simulator
Flip a fair coin or roll dice of any type — d4 to d100 — with cryptographically-random results, a running tally and history. No ads, no tracking.
Open Tool →Reaction Time Test
Measure how fast you respond to a visual cue across five rounds — get your average, best, and worst reaction times with percentile benchmarks.
Open Tool →Stroop Test
Measure attention and cognitive flexibility with the classic Stroop colour-word interference test — track accuracy and reaction time per trial.
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